{"id":65948,"date":"2025-05-03T15:54:14","date_gmt":"2025-05-03T07:54:14","guid":{"rendered":"https:\/\/fwq.ai\/blog\/65948\/"},"modified":"2025-05-03T15:54:14","modified_gmt":"2025-05-03T07:54:14","slug":"java%e6%80%8e%e4%b9%88%e5%b0%86%e9%9b%86%e5%90%88%e8%be%93%e5%85%a5%e5%88%b0%e6%95%b0%e7%bb%84-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/65948\/","title":{"rendered":"java\u600e\u4e48\u5c06\u96c6\u5408\u8f93\u5165\u5230\u6570\u7ec4"},"content":{"rendered":"

\n java\u4e2d\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u7684\u65b9\u6cd5\u662f\u4f7f\u7528arrays.copyof()\u65b9\u6cd5\uff0c\u5b83\u63a5\u53d7\u96c6\u5408\u548c\u6570\u7ec4\u7c7b\u578b\u4f5c\u4e3a\u53c2\u6570\uff0c\u8fd4\u56de\u4e00\u4e2a\u6307\u5b9a\u7c7b\u578b\u7684\u65b0\u6570\u7ec4\uff0c\u5305\u542b\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5143\u7d20\u3002\n<\/p><\/blockquote>\n

\"java\u600e\u4e48\u5c06\u96c6\u5408\u8f93\u5165\u5230\u6570\u7ec4\u63d2\u56fe\"<\/p>\n

Java \u4e2d\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4<\/strong><\/p>\n

\u5728 Java \u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 Arrays.copyOf()<\/strong> \u65b9\u6cd5\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u3002\u8be5\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u96c6\u5408\u548c\u4e00\u4e2a\u6570\u7ec4\u7c7b\u578b\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u6307\u5b9a\u7c7b\u578b\u7684\u65b0\u6570\u7ec4\uff0c\u8be5\u6570\u7ec4\u5305\u542b\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5143\u7d20\u3002<\/p>\n

\u8bed\u6cd5\uff1a<\/strong><\/p>\n

public static <T> T[] copyOf(Collection<? extends T> coll, Class<T[]> newType)<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u4f7f\u7528\u65b9\u6cd5\uff1a<\/strong><\/p>\n
\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n
List<Integer> list = new ArrayList<>();\nlist.add(1);\nlist.add(2);\nlist.add(3);\n\n\/\/ \u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6574\u578b\u6570\u7ec4\nint[] arr = Arrays.copyOf(list, int[].class);\n\n\/\/ \u6253\u5370\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\nfor (int num : arr) {\n    System.out.println(num);\n}<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u793a\u4f8b\u8f93\u51fa\uff1a<\/strong><\/p>\n
1\n2\n3<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n
    \n
  •  Arrays.copyOf()<\/strong> \u65b9\u6cd5\u4f1a\u521b\u5efa\u65b0\u6570\u7ec4\uff0c\u8be5\u6570\u7ec4\u7684\u7c7b\u578b\u7531 newType<\/strong> \u53c2\u6570\u6307\u5b9a\u3002<\/li>\n
  •  newType<\/strong> \u53c2\u6570\u5fc5\u987b\u662f\u6570\u7ec4\u7c7b\u578b\u3002<\/li>\n
  • \u5982\u679c\u96c6\u5408\u5305\u542b\u4e0d\u540c\u7c7b\u578b\u7684\u5143\u7d20\uff0c\u5219 Arrays.copyOf()<\/strong> \u65b9\u6cd5\u4f1a\u629b\u51fa ClassCastException<\/strong> \u5f02\u5e38\u3002<\/li>\n
  • \u4e5f\u53ef\u4ee5\u4f7f\u7528 Arrays.toArray()<\/strong> \u65b9\u6cd5\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\uff0c\u4f46\u5b83\u53ea\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u96c6\u5408\u4e2d\u6240\u6709\u5143\u7d20\u7684 Object[] \u6570\u7ec4\u3002<\/li>\n<\/ul>\n
    \u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u5c06\u96c6\u5408\u8f93\u5165\u5230\u6570\u7ec4\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    java\u4e2d\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u7684\u65b9\u6cd5\u662f\u4f7f\u7528arrays.copyof()\u65b9\u6cd5\uff0c\u5b83\u63a5\u53d7\u96c6\u5408\u548c\u6570\u7ec4\u7c7b\u578b\u4f5c\u4e3a\u53c2\u6570\uff0c\u8fd4\u56de\u4e00\u4e2a\u6307\u5b9a\u7c7b\u578b\u7684\u65b0\u6570\u7ec4\uff0c\u5305\u542b\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5143\u7d20\u3002 Java \u4e2d\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4 \u5728 Java \u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 Arrays.copyOf() \u65b9\u6cd5\u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6570\u7ec4\u3002\u8be5\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u96c6\u5408\u548c\u4e00\u4e2a\u6570\u7ec4\u7c7b\u578b\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u6307\u5b9a\u7c7b\u578b\u7684\u65b0\u6570\u7ec4\uff0c\u8be5\u6570\u7ec4\u5305\u542b\u96c6\u5408\u4e2d\u7684\u6240\u6709\u5143\u7d20\u3002 \u8bed\u6cd5\uff1a public static <T> T[] copyOf(Collection<? extends T> coll, Class<T[]> newType) \u767b\u5f55\u540e\u590d\u5236 \u4f7f\u7528\u65b9\u6cd5\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b List<Integer> list = new ArrayList<>(); list.add(1); list.add(2); list.add(3); \/\/ \u5c06\u96c6\u5408\u8f6c\u6362\u4e3a\u6574\u578b\u6570\u7ec4 int[] arr = Arrays.copyOf(list, int[].class); \/\/ \u6253\u5370\u6570\u7ec4\u4e2d\u7684\u5143\u7d20 for (int num : arr) { System.out.println(num); } \u767b\u5f55\u540e\u590d\u5236 \u793a\u4f8b\u8f93\u51fa\uff1a 1 2 3 \u767b\u5f55\u540e\u590d\u5236 \u6ce8\u610f\u4e8b\u9879\uff1a Arrays.copyOf() […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-65948","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65948","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=65948"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65948\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=65948"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=65948"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=65948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}